Tsunami messages are National Weather Service (NWS) products. NWS products are described by both a World Meteorological Organization (WMO) Header and an Advanced Weather Interactive Processing System (AWIPS) ID. The following table describes the products (click on the product for an example).
WEPA41 and WEXX20 are segmented Warning, Watch, and Advisory products which contain Universal Geographic Code and NWS Valid Time Event Codes. WEAK51 and WEXX30 are public Warning, Watch, and Advisory products which are provided in a bulleted format intended for easy reading.